busvoodoo: add UART mode (incomplete)

This commit is contained in:
King Kévin 2018-01-24 16:36:19 +01:00
parent b6419954f7
commit da1786228a
2 changed files with 317 additions and 0 deletions

294
lib/busvoodoo_uart.c Normal file
View File

@ -0,0 +1,294 @@
/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** BusVoodoo UART mode (code)
* @file busvoodoo_uart.c
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2018
* @note peripherals used: USART @ref busvoodoo_uart
*/
/* standard libraries */
#include <stdint.h> // standard integer types
#include <stdlib.h> // standard utilities
#include <string.h> // string utilities
/* STM32 (including CM3) libraries */
#include <libopencm3/stm32/gpio.h> // general purpose input output library
#include <libopencm3/stm32/rcc.h> // real-time control clock library
#include <libopencm3/stm32/usart.h> // USART utilities
/* own libraries */
#include "global.h" // board definitions
#include "print.h" // printing utilities
#include "menu.h" // menu definitions
#include "busvoodoo_global.h" // BusVoodoo definitions
#include "busvoodoo_uart.h" // own definitions
/** @defgroup busvoodoo_uart USART peripheral used for UART communication
* @{
*/
#define BUSVOODOO_USART_ID 3 /**< USART peripheral */
/** @} */
/** mode setup stage */
static enum busvoodoo_uart_setting_t {
BUSVOODOO_UART_SETTING_NONE,
BUSVOODOO_UART_SETTING_BAUDRATE,
BUSVOODOO_UART_SETTING_DATABITS,
BUSVOODOO_UART_SETTING_PARITY,
BUSVOODOO_UART_SETTING_STOPBITS,
BUSVOODOO_UART_SETTING_DRIVE,
BUSVOODOO_UART_SETTING_DONE,
} busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_NONE;
/** UART baud rate (in bps) */
uint32_t busvoodoo_uart_baudrate = 115200;
/** UART data bits */
uint8_t busvoodoo_uart_databits = 8;
/** UART parity setting */
char busvoodoo_uart_parity= 'n';
/** UART stop bits (multiplied by 2) */
uint8_t busvoodoo_uart_stopbits = 2;
/** pin drive mode */
char busvoodoo_uart_drive = 'p';
/** setup UART mode
* @param[out] prefix terminal prompt prefix
* @param[in] line terminal prompt line to configure mode
* @return if setup is complete
*/
static bool busvoodoo_uart_setup(char** prefix, const char* line)
{
bool complete = false; // is the setup complete
static char config[39] = {0}; // configuration string used as prefix
if (NULL==line) { // first call
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_NONE; // re-start configuration
}
switch (busvoodoo_uart_setting) {
case BUSVOODOO_UART_SETTING_NONE:
snprintf(config, LENGTH(config), "baud rate in bps (1-2000000) [%u]", busvoodoo_uart_baudrate);
*prefix = config; // ask for baud rate
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_BAUDRATE;
break;
case BUSVOODOO_UART_SETTING_BAUDRATE:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DATABITS; // go to next setting
} else { // setting provided
uint32_t baudrate = atoi(line); // parse setting
if (baudrate>0 && baudrate<2000000) { // check setting
busvoodoo_uart_baudrate = baudrate; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DATABITS; // go to next setting
}
}
if (BUSVOODOO_UART_SETTING_DATABITS==busvoodoo_uart_setting) { // if next setting
snprintf(config, LENGTH(config), "data bits (8-9) [%u]", busvoodoo_uart_databits); // prepare next setting
*prefix = config; // display next setting
}
break;
case BUSVOODOO_UART_SETTING_DATABITS:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_PARITY; // go to next setting
} else { // setting provided
uint8_t databits = atoi(line); // parse setting
if (8==databits || 9==databits) { // check setting
busvoodoo_uart_databits = databits; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_PARITY; // go to next setting
}
}
if (BUSVOODOO_UART_SETTING_PARITY==busvoodoo_uart_setting) { // if next setting
snprintf(config, LENGTH(config), "parity (n,e,o) [%c]", busvoodoo_uart_parity); // prepare next setting
*prefix = config; // display next setting
}
break;
case BUSVOODOO_UART_SETTING_PARITY:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_STOPBITS; // go to next setting
} else { // setting provided
if (0==strcmp("n", line) || 0==strcmp("e", line) || 0==strcmp("o", line)) { // check setting
busvoodoo_uart_parity = line[0]; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_STOPBITS; // go to next setting
}
}
if (BUSVOODOO_UART_SETTING_STOPBITS==busvoodoo_uart_setting) { // if next setting
snprintf(config, LENGTH(config), "stop bits (0.5-2.0) [%.1f]", busvoodoo_uart_stopbits/2.0); // prepare next setting
*prefix = config; // display next setting
}
break;
case BUSVOODOO_UART_SETTING_STOPBITS:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DRIVE; // go to next setting
} else { // setting provided
if (0==strcmp("0.5", line) || 0==strcmp(".5", line)) { // check setting
busvoodoo_uart_stopbits = 1; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DRIVE; // go to next setting
} else if (0==strcmp("1", line) || 0==strcmp("1.0", line)) { // check setting
busvoodoo_uart_stopbits = 2; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DRIVE; // go to next setting
} else if (0==strcmp("1.5", line)) { // check setting
busvoodoo_uart_stopbits = 3; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DRIVE; // go to next setting
} else if (0==strcmp("2", line) || 0==strcmp("2.0", line)) { // check setting
busvoodoo_uart_stopbits = 4; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DRIVE; // go to next setting
}
}
if (BUSVOODOO_UART_SETTING_DRIVE==busvoodoo_uart_setting) { // if next setting
printf("p) push-pull (3.3V)\n");
printf("o) open-drain (set lV do desired voltage), with embedded pull-up (2kR)\n");
snprintf(config, LENGTH(config), "drive mode (p,o) [%c]", busvoodoo_uart_drive); // show drive mode
*prefix = config; // display next setting
}
break;
case BUSVOODOO_UART_SETTING_DRIVE:
if (NULL==line || 0==strlen(line)) { // use default setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DONE; // go to next setting
} else { // setting provided
if (0==strcmp("p", line) || 0==strcmp("o", line)) { // check setting
busvoodoo_uart_drive = line[0]; // remember setting
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_DONE; // go to next setting
}
}
if (BUSVOODOO_UART_SETTING_DONE==busvoodoo_uart_setting) { // we have all settings, configure UART
rcc_periph_clock_enable(USART_RCC(BUSVOODOO_USART_ID)); // enable clock for USART peripheral
usart_set_baudrate(USART(BUSVOODOO_USART_ID), busvoodoo_uart_baudrate); // set baud rate
usart_set_databits(USART(BUSVOODOO_USART_ID), busvoodoo_uart_databits); // set data bits
switch (busvoodoo_uart_parity) { // set parity
case 'n':
usart_set_parity(USART(BUSVOODOO_USART_ID), USART_PARITY_NONE);
break;
case 'e':
usart_set_parity(USART(BUSVOODOO_USART_ID), USART_PARITY_EVEN);
break;
case 'o':
usart_set_parity(USART(BUSVOODOO_USART_ID), USART_PARITY_ODD);
break;
default:
usart_set_parity(USART(BUSVOODOO_USART_ID), USART_PARITY_NONE);
break;
}
switch (busvoodoo_uart_stopbits) { // set stop bits
case 1:
usart_set_stopbits(USART(BUSVOODOO_USART_ID), USART_STOPBITS_0_5);
break;
case 2:
usart_set_stopbits(USART(BUSVOODOO_USART_ID), USART_STOPBITS_1);
break;
case 3:
usart_set_stopbits(USART(BUSVOODOO_USART_ID), USART_STOPBITS_1_5);
break;
case 4:
usart_set_stopbits(USART(BUSVOODOO_USART_ID), USART_STOPBITS_2);
break;
default:
usart_set_stopbits(USART(BUSVOODOO_USART_ID), USART_STOPBITS_1);
break;
}
usart_set_flow_control(USART(BUSVOODOO_USART_ID), USART_FLOWCONTROL_NONE); // set hardware flow control
usart_set_mode(USART(BUSVOODOO_USART_ID), USART_MODE_TX_RX); // full-duplex communication
switch (busvoodoo_uart_drive) { // set drive mode
case 'p':
busvoodoo_embedded_pullup(false); // disable embedded pull-ups
gpio_set_mode(USART_PORT(BUSVOODOO_USART_ID), GPIO_MODE_OUTPUT_10_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, USART_PIN_TX(BUSVOODOO_USART_ID)); // setup GPIO pin USART transmit
gpio_set_mode(USART_PORT(BUSVOODOO_USART_ID), GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, USART_PIN_RX(BUSVOODOO_USART_ID)); // setup GPIO pin USART receive
gpio_set(USART_PORT(BUSVOODOO_USART_ID), USART_PIN_RX(BUSVOODOO_USART_ID)); // pull up to avoid noise when not connected
break;
case 'o':
busvoodoo_embedded_pullup(true); // enable embedded pull-ups
gpio_set_mode(USART_PORT(BUSVOODOO_USART_ID), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, USART_PIN_TX(BUSVOODOO_USART_ID)); // setup GPIO pin USART transmit
gpio_set_mode(USART_PORT(BUSVOODOO_USART_ID), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, USART_PIN_RX(BUSVOODOO_USART_ID)); // setup GPIO pin USART receive
break;
}
usart_enable(USART(BUSVOODOO_USART_ID)); // enable USART
printf("I/O pinout:\n");
printf("+----- -------+\n");
printf("|xx xx RX 3V3 GND|\n");
printf("|xx xx TX lV 5V |\n");
printf("+----------------+\n");
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_NONE; // restart settings next time
complete = true; // configuration is complete
*prefix = "UART"; // display mode
}
break;
default: // unknown case
busvoodoo_uart_setting = BUSVOODOO_UART_SETTING_NONE; // restart settings next time
break;
}
return complete;
}
/** exit UART mode
*/
static void busvoodoo_uart_exit(void)
{
usart_disable(USART(BUSVOODOO_USART_ID)); // disable USART
rcc_periph_clock_enable(USART_RCC(BUSVOODOO_USART_ID)); // disable domain clock
gpio_set_mode(USART_PORT(BUSVOODOO_USART_ID), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, USART_PIN_TX(BUSVOODOO_USART_ID)); // set pin back to floating input
gpio_set_mode(USART_PORT(BUSVOODOO_USART_ID), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, USART_PIN_RX(BUSVOODOO_USART_ID)); // set pin back to floating input
busvoodoo_embedded_pullup(false); // disable embedded pull-ups
}
// command handlers
/** command to transmit a word
* @param[in] argument word to transmit
*/
static void busvoodoo_uart_command_transmit(void* argument)
{
if (NULL==argument || 0==strlen(argument)) { // nothing to transmit
return;
}
uint16_t i=0;
while (((char*)(argument))[i]) { // go through word to send
usart_send_blocking(USART(BUSVOODOO_USART_ID), ((char*)(argument))[i++]); // send character
}
}
/** command to receive data
* @param[in] argument no argument required
*/
static void busvoodoo_uart_command_receive(void* argument)
{
(void)argument; // we won't use the argument
while (true) {
char c = usart_recv_blocking(USART(BUSVOODOO_USART_ID)); // receive character
printf("%c", c); // print received character
}
}
static const struct menu_command_t busvoodoo_uart_commands[] = {
{
'r',
"receive",
"show incoming data",
MENU_ARGUMENT_NONE,
NULL,
&busvoodoo_uart_command_receive,
},
{
't',
"transmit",
"transmit word",
MENU_ARGUMENT_STRING,
"word",
&busvoodoo_uart_command_transmit,
},
};
struct busvoodoo_mode_t busvoodoo_uart_mode = {
"uart",
"Universal Asynchronous Receiver-Transmitter",
&busvoodoo_uart_setup,
busvoodoo_uart_commands,
LENGTH(busvoodoo_uart_commands),
&busvoodoo_uart_exit,
};

23
lib/busvoodoo_uart.h Normal file
View File

@ -0,0 +1,23 @@
/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** BusVoodoo UART mode (API)
* @file busvoodoo_uart.h
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2018
* @note peripherals used: USART @ref busvoodoo_uart
*/
/** UART mode interface definition */
extern struct busvoodoo_mode_t busvoodoo_uart_mode;